<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="编辑课程基本信息"/>
      <el-step title="编辑课程大纲"/>
      <el-step title="课程最终发布"/>
    </el-steps>

    <el-form label-width="120px">

      <el-button type="text" @click="openInsertChapterDialog">添加章节</el-button>
      <!-- 章节 -->
      <ul class="chanpterList">
          <li
              v-for="chapter in AllChapterAndVideo"
              :key="chapter.id">
              <p>
                  {{ chapter.title }}

                  <span class="acts">
                      <el-button type="text" @click="openInsertVideoDialog(chapter.id)">添加课时</el-button>
                      <el-button type="text" @click="openUpdateChapterDialog(chapter.id)">编辑</el-button>
                      <el-button type="text" @click="deleteChapterBtn(chapter.id)">删除</el-button>
                  </span>
              </p>

              <!-- 视频 -->
              <ul class="chanpterList videoList">
                  <li
                      v-for="video in chapter.children"
                      :key="video.id">
                      <p>{{ video.title }}
                          <span class="acts">
                              <el-button type="text" @click="openUpdateVideoDialog(video.id)">编辑</el-button>
                              <el-button type="text" @click="openDeleteVideoDialog(video.id)">删除</el-button>
                          </span>
                      </p>
                  </li>
              </ul>
          </li>
      </ul>

      <!-- 添加和修改章节表单 -->
      <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
          <el-form :model="chapter" label-width="120px">
              <el-form-item label="章节标题">
                  <el-input v-model="chapter.title"/>
              </el-form-item>
              <el-form-item label="章节排序">
                  <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
              </el-form-item>
          </el-form>
          <div slot="footer" class="dialog-footer">
              <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
              <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
          </div>
      </el-dialog>


      <!-- 添加和修改课时表单 -->
      <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
        <el-form :model="video" label-width="120px">
          <el-form-item label="课时标题">
            <el-input v-model="video.title"/>
          </el-form-item>
          <el-form-item label="课时排序">
            <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
          </el-form-item>
          <el-form-item label="是否免费">
            <el-radio-group v-model="video.free">
              <el-radio :label="true">免费</el-radio>
              <el-radio :label="false">默认</el-radio>
            </el-radio-group>
          </el-form-item>
          <el-form-item label="上传视频">
            <el-upload
                  :on-success="handleVodUploadSuccess"
                  :on-remove="handleVodRemove"
                  :before-remove="beforeVodRemove"
                  :on-exceed="handleUploadExceed"
                  :file-list="fileList"
                  :action="BASE_API+'/vodservice/video/uploadVideo'"
                  :limit="1"
                  class="upload-demo">
            <el-button size="small" type="primary">上传视频</el-button>
            <el-tooltip placement="right-end">
                <div slot="content">最大支持1G，<br>
                    支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                    GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                    MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                    SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                <i class="el-icon-question"/>
            </el-tooltip>
            </el-upload>
          </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
          <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
          <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
        </div>
      </el-dialog>


      <div class="el-form-item-my">
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
      </div>
    </el-form>
  </div>
</template>

<script>
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'
import vod from '@/api/edu/vod'

export default {
  data() {
    return {
      AllChapterAndVideo: [],
      courseId: '',
      chapter: {
        title: '',
        sort: 0
      },
      video: {
        title: '',
        sort: 0,
        free: 0,
        videoSourceId: ''
      },
      saveBtnDisabled: false, // 保存按钮是否禁用
      saveVideoBtnDisabled: false, // 课时按钮是否禁用
      dialogChapterFormVisible: false,
      dialogVideoFormVisible: false,
      BASE_API: process.env.BASE_API,// 接口API地址
      fileList: []// 上传文件列表
    }
  },

  created() {
    this.init()
  },

  methods: {

    // 初始化（判断路径是否包含课程id）
    init() {
      if(this.$route.params && this.$route.params.id) {
        this.courseId = this.$route.params.id
        // 根据id获取课程基本信息
        this.queryChapterAndVideoByCourseId()
      }
    },

//-------------------------------------小节操作start-------------------------------------

    saveOrUpdateVideo() {
      if(this.video.id) {
        this.updateVideo()
      } else {
        this.insertVideo()
      }
    },

    // 编辑小节按钮
    openUpdateVideoDialog(id) {
      // 显示弹框
      this.dialogVideoFormVisible = true
      this.queryVideoById(id)
    },

    // 删除小节按钮
    openDeleteVideoDialog(id) {
      this.deleteVideoById(id)
    },

    // 添加课时按钮
    openInsertVideoDialog(id) {
      this.dialogVideoFormVisible = true
      this.video.chapterId = id
      // 清空对象
      this.fileList = [],
      this.video.title = '',
      this.video.sort = 0,
      this.video.free = 0,
      this.video.id = '',
      this.video.videoSourceId = ''
    },

    // 上传视频成功回调
    handleVodUploadSuccess(response, file, fileList) {
      this.video.videoSourceId = response.data.videoId
    },

    // 想要上传一个视频
    handleUploadExceed(files, fileList) {
      this.$message.warning('想要重新上传视频，请先删除已上传的视频')
    },

    // 删除上传视频要回调
    beforeVodRemove(file, fileList) {
      return this.$confirm(`确定移除${file.name}吗？`)
    },

    // 删除上传视频之后
    handleVodRemove(file, fileList) {
      vod.deleteVideoByVideoId(this.video.videoSourceId)
        .then(response => {
          this.$message({
            type: 'success',
            message: response.message
          })
        })
    },

    // 新增小节
    insertVideo() {
      // 设置一下课程id
      this.video.courseId = this.courseId
      video.insertVideo(this.video)
        .then(response => {
          // 关闭弹窗
          this.dialogVideoFormVisible = false
          
          // 提示消息
          this.$message({
            type: 'success',
            message: '小节新增成功！'
          })

          // 刷新
          this.queryChapterAndVideoByCourseId()
        })
    },

    // 根据小节id查询小节
    queryVideoById(id) {
      video.queryVideoById(id)
        .then(response => {
          this.video = response.data.video
        })
    },

    // 更新小节
    updateVideo() {
      video.updateVideo(this.video)
        .then(response => {
          // 关闭弹窗
          this.dialogVideoFormVisible = false

          // 提示消息
          this.$message({
            type: 'success',
            message: '更新小节成功！'
          })

          // 刷新
          this.queryChapterAndVideoByCourseId()
        })
    },

    // 根据小节id删除小节
    deleteVideoById(id) {
      this.$confirm('此操作将永久删除该章节, 是否继续?', '提示', {
      confirmButtonText: '确定',
      cancelButtonText: '取消',
      type: 'warning'
      }).then(() => {
        // 调用后台删除的方法
        video.deleteVideoById(id)
          .then(response => {
            // 提示信息
            this.$message({
              type: 'success',
              message: '删除小节成功!'
            });
            // 删除后回到列表页面
            this.queryChapterAndVideoByCourseId()
          })
      });
    },

    



//-------------------------------------小节操作end-------------------------------------


//-------------------------------------章节操作start-------------------------------------

    saveOrUpdate() {
      // 根据章节id判断是否是更新方法
      if (this.chapter.id) {
        this.updateChapter()
      } else {
        this.insertChapter()
      }
    },

    // 添加章节按钮
    openInsertChapterDialog() {
      this.dialogChapterFormVisible = true
      this.video.chapterId = 
      // 清空对象
      this.chapter.title = '',
      this.chapter.sort = 0,
      this.chapter.id = ''
    },

    // 编辑章节按钮
    openUpdateChapterDialog(id) {
      this.dialogChapterFormVisible = true
      // 查询章节（回显数据）
      this.queryChapterById(id)
    },

    // 删除章节按钮
    deleteChapterBtn(id) {
      this.deleteChapterById(id)
    },

    // 新增章节
    insertChapter() {
      // 设置一下课程id
      this.chapter.courseId = this.courseId
      chapter.insertChapter(this.chapter)
        .then(response => {
          // 1. 关闭弹框
          this.dialogChapterFormVisible = false

          // 2. 提示信息
          this.$message({
            type: 'success',
            message: '章节新增成功！'
          })

          // 3. 刷新页面
          this.queryChapterAndVideoByCourseId()
        })
    },

    // 根据id查询章节
    queryChapterById(id) {
      chapter.queryChapterById(id)
        .then(response => {
          this.chapter = response.data.chapter
        })
    },

    // 根据章节对象更新数据
    updateChapter() {
      chapter.updateChapter(this.chapter)
        .then(response => {
          // 关闭弹窗
          this.dialogChapterFormVisible = false

          // 提示消息
          this.$message({
            type: 'success',
            message: '章节更新成功！'
          })

          // 刷新页面
          this.queryChapterAndVideoByCourseId()
        })
    },

    // 根据id删除章节
    deleteChapterById(id) {
      this.$confirm('此操作将永久删除该章节, 是否继续?', '提示', {
      confirmButtonText: '确定',
      cancelButtonText: '取消',
      type: 'warning'
      }).then(() => {
        // 调用后台删除的方法
        chapter.deleteChapterById(id)
          .then(response => {
            // 提示信息
            this.$message({
              type: 'success',
              message: '删除章节成功!'
            });
            // 删除后回到列表页面
            this.queryChapterAndVideoByCourseId()
          })
      });
    },

//-------------------------------------章节操作end-------------------------------------

    // 根据课程id查询章节和小节信息
    queryChapterAndVideoByCourseId() {
      chapter.queryChapterAndVideoByCourseId(this.courseId)
        .then(response => {
          this.AllChapterAndVideo = response.data.chapterVos
        })
    },

    

    previous() {
      console.log('previous')
      this.$router.push({ path: '/course/info/'+this.courseId })
    },

    next() {
      console.log('next')
      this.$router.push({ path: '/course/publish/'+this.courseId })
    }
  }
}
</script>

<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
  height: 70px;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList{
  padding-left: 50px;
}
.chanpterList li[data-v-5c4f306c]{
  height: 0px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}
.el-form-item-my {
    width: 183px;
    margin: 0 auto;
}

</style>